Drill Guide Chamfer Lubricant Pocket for Stable Bore Quality
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Solution Overview
Problem
Drilling tools, particularly twist drills, experience high wear on guide chamfers due to skin friction with the bore wall, leading to destabilization and reduced drilling quality, especially when drilling difficult materials, and existing cooling lubricant systems fail to effectively reduce this friction.
Innovation Solution
The introduction of a drilling tool with helical grooves and a lubricant pocket formed between primary and secondary guide chamfers, which acts as a reservoir for cooling lubricant, actively directing it to the guide chamfers to reduce friction and wear by forming a hydrostatic radial bearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If guide chamfers are used to stabilize the drill bit against pendulum motions, then drilling stability and bore quality are improved, but friction and wear on the guide chamfers increase significantly
Solution Approach 1:
The patent introduces cooling lubricant as an intermediary substance between the guide chamfers and the bore wall. The lubricant forms a fluid film that mediates the contact interaction, reducing direct solid-to-solid friction and wear on the guide chamfers while maintaining their stabilizing function.
Solution Approach 2:
The patent employs hydraulic lubrication by introducing liquid cooling lubricant into the contact zone between the guide chamfers and the bore wall. This hydraulic film replaces direct mechanical contact, significantly reducing friction and wear while preserving the guide chamfers' ability to stabilize the drill bit.
2Reliability
If internal coolant supply is used to reduce friction during cutting, then cutting edge performance is improved, but the coolant does not reach the guide chamfer contact surfaces
Solution Approach 1:
The patent segments the coolant supply system into two distinct pathways: one for the cutting edges and another for the guide chamfers. Separate coolant channels and injection points are provided, allowing independent optimization of lubrication for each functional area without interference from the other.
Solution Approach 2:
The patent applies local quality by providing targeted coolant delivery specifically to the guide chamfer contact zones. The coolant is injected at specific locations where the guide chamfers contact the bore wall, ensuring localized lubrication exactly where needed without affecting the overall coolant distribution system.
3Manufacturing precision
If multiple guide chamfers are used to improve radial guidance, then bore quality and coaxiality are improved, but friction and wear increase due to more contact surfaces
Solution Approach 1:
The patent uses cooling lubricant as a mediator film between each guide chamfer and the bore wall. This lubricant layer reduces the frictional interaction for each contact surface, allowing multiple guide chamfers to be used for improved guidance without proportionally increasing wear on each chamfer.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly reduces skin friction and wear on guide chamfers, improving drilling stability and quality by ensuring consistent lubrication and cooling along the drilling tool's circumference, thereby extending tool life and maintaining high drilling performance.
Implementation Method 1
reduce the friction between the rotating drilling tool and the bore wall
Implementation Method 2
the resulting frictional heat can be dissipated via the coolant flowing towards the drill shank
Data Source
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AI summary
The invention relates to a drilling tool (1) for the cooling-lubricant-assisted production of drill holes, comprising: a drill shaft (10), a drill front (20) with main cutting edges (22) and free areas (24) formed thereon, at least one tensioning nut (30) extending axially, at least one coolant channel (12) running in the drilling tool for the internal supply of cooling lubricant, and at least two primary guide bevels (41) arranged on the circumferential surface of the drilling tool (1) and extending axially, wherein a secondary guide bevel (42) is formed next to at least one of the primary guide bevels (41), running along the primary guide bevel (41), at a distance therefrom in the circumferential direction of the drilling tool (1), and a lubricant pocket (50) for accommodating cooling lubricant is formed between the primary guide bevel (41) and the secondary guide bevel (42).